Stiffened wall plate compression stability test support fixture and end support coefficient test method

Abstract

The invention belongs to the strength testing techniques of airplanes, and relates to a testing method for a supporting coefficient of a loading end in a compression stabilization experiment of a wallboard. A supporting clamp for the compression stabilization experiment of a reinforced wallboard comprises a hinged support clamp with a supporting coefficient of 1, a simple support clamp with a supporting coefficient between 1 and 4, and a fixed support clamp with a supporting coefficient of 4; a rectangular groove is processed on one side of the plane of an articulation block; and the end socket of a test piece is directly embedded in the rectangular groove. In the invention, the design of the test piece is given first; then a foil gauge is arranged, and the test piece and the clamps are mounted; a compression load is loaded hierarchically, and the load-stress is tracked and measured; when a curve knee point is discovered, the load is unloaded, and the load at the knee point is recorded; the load at the knee point is led in a theoretical formula to obtain the supporting coefficient; and finally, through increasing H or increasing clamping force, the supporting coefficient is adjusted. The method has the characteristics of simple operation, high loading precision and low cost.

Description

Technical field [0001] The invention belongs to the aircraft strength testing technology and relates to a testing method for the support coefficient of the loading end during the compression stability test of a wall panel. Background technique [0002] The practice of aircraft development reflects that most of the static tests of aircraft are caused by the destruction of the entire aircraft due to structural stability failure. Therefore, starting from the 1970s, through the efforts of several generations of domestic research units, starting from the basic concepts and basic theories of structural stability, they have studied and provided critical buckling analysis methods for various structures. [0003] However, the problem of the stability of thin-walled structure under compression is more complicated, because the thin-walled structure can still bear the load after "over-buckling". For such a load-bearing state, the failure problem is intertwined with material nonlinearity and g...

AI Technical Summary

Problems solved by technology

However, in the compression stability test of the reinforced panel, the boundary support coefficient should simulate any form from hinged support to fixed support, that is, any form of support coefficient between 1 and 4. The design of support fixtures that meet the test requirements faces more challenges.

[0005] In previous verification tests, the loading end of the wall plate was a straight cross-section, which was in surface contact with the upper and lower chuck planes of the testing machine, and its support coefficient often only met the boundary requirements of fixed support 4 and a certain simply supported state, and could not simulate hinged support 1 Header Support Requirements for

Or design a suitable stiffened plate dummy in advance, measure the support coefficient of the loading end of the testing machine, estimate the effective length of the test piece, and then guide the test client to design the test piece. However, such a design procedure is complicated and long, and there is no universal value, less useful

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